Hello! I am new to Materials Studio software and community, so please excuse me if my questions are a bit trivial.

I am attempting to build a structure with the diamond structure (fd-3m).  I am replaceing the carbon atoms with a 3d building block.  I first make the structure P1, copy and paste the buidling block onto the diamond lattice and align it.  I believe I have my building block fully alinged with the C-C bonds, but when I try to rebuild the crystal, the unit looks like it spazzes out (i.e. it does't add the building block to each of the lattice points where I want it to).  Does anyone know what I am doing incorrectly?

Sorry if this post is a little vague.  Please respond with questions if you are confused with the explanation of my problem.